Tests detected gas underground after NYC blast

Firefighters look over the site of a building explosion in New York, Friday, March 14, 2014. Using sound devices to probe for voices and telescopic cameras to peer into small spaces, workers searching a pile of rubble from a gas explosion in the East Harlem section of Manhattan, continued to treat it as a rescue operation, holding onto the possibility of finding survivors from a blast that brought down two apartment buildings and killed at least eight people.